package com.changgou.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpCookie;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author 秦川熙
 */
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

    /**
     * 令牌头名字
     */
    private static final String AUTHORIZE_TOKEN = "Authorization";

    /**
     * 全局过滤器
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取Request、Response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //获取请求的URI
        String path = request.getURI().getPath();
//        System.out.println(path);
//        String userUri = "/api/user/login";
//        String brandUri = "/api/brand/search";



        //如果是登录， goods等开放的微服务【这里的goods部分开放】， 则直接方行， 这里不做完整演示， 完整演示需要设计一套权限系统
        //如果包含 则放行
        if (!URLFilter.hasAuthorize(path)) {
            //放行
            Mono<Void> filter = chain.filter(exchange);
            return  filter;
        }

        //获取头文件中的令牌信息
        String tokent = request.getHeaders().getFirst(AUTHORIZE_TOKEN);

        //如果头文件中没有， 则从请求参数中获取
        if (StringUtils.isEmpty(tokent)) {
            tokent = request.getQueryParams().getFirst(AUTHORIZE_TOKEN);
        }

        //从Cookie中获取
        if (StringUtils.isEmpty(tokent)) {
            HttpCookie httpCookie = request.getCookies().getFirst(AUTHORIZE_TOKEN);
            if (httpCookie != null) {
                tokent = httpCookie.getValue();
            }
        }

        //如果为空， 则输出错误代码
        if (StringUtils.isEmpty(tokent)) {
            //设置方法不允许被访问， 405错误代码
            response.setStatusCode(HttpStatus.METHOD_NOT_ALLOWED);
            return response.setComplete();
        }

        //解析令牌
        try {
            //Claims claims = JwtUtil.parseJWT(tokent);
            //将令牌数据添加到头文件中
            request.mutate().header(AUTHORIZE_TOKEN, "Bearer" + tokent);
        } catch (Exception e) {
            e.printStackTrace();
            //解析失败， 相应401错误
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //放行
        return chain.filter(exchange);
    }

    /**
     * 过滤器执行顺序
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
